UXP Toolkit
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    Interface IndexedConversionOptions

    Options for converting an RGB image to an indexed color model using Document.changeMode

    https://developer.adobe.com/photoshop/uxp/2022/ps_reference/classes/document/#changemode

    const doc = app.activeDocument;
    await doc.changeMode(constants.ChangeMode.INDEXEDCOLOR, {
      palette: constants.Palette.LOCALPERCEPTUAL,
      colors: 256,
      dither: constants.Dither.DIFFUSION,
      transparency: true
    });

    // Convert with web palette
    await doc.changeMode(constants.ChangeMode.INDEXEDCOLOR, {
      palette: constants.Palette.WEBPALETTE,
      colors: 216,
      preserveExactColors: true
    });

    objects/conversionoptions

    23.0

    interface IndexedConversionOptions {
        colors?: number;
        dither?: Dither;
        ditherAmount?: number;
        forced?: ForcedColors;
        matte?: MatteColor;
        palette?: Palette;
        preserveExactColors?: boolean;
        transparency?: boolean;
    }
    Index

    Properties

    colors? dither? ditherAmount? forced? matte? palette? preserveExactColors? transparency?

    Properties

    colors?: number

    The number of palette colors.

    Valid only with palette types: LOCALADAPTIVE, LOCALPERCEPTUAL, LOCALSELECTIVE, MACOSPALETTE, UNIFORM, WEBPALETTE, or WINDOWSPALETTE.

    23.0

    dither?: Dither

    The type of dithering to be done.

    23.0

    ditherAmount?: number

    The amount of dithering to be done.

    Valid only when dither typ is DIFFUSION.

    23.0

    forced?: ForcedColors

    The set of colors to force into the color palette.

    23.0

    matte?: MatteColor

    The color to use to fill anti-aliased edges adjacent to transparent areas of the image.

    When transparency is false, the matte color is applied to transparent areas.

    WHITE

    23.0

    palette?: Palette

    The palette type.

    23.0

    preserveExactColors?: boolean

    When true, the image colors matching entries in the color table will not be dithered.

    23.0

    transparency?: boolean

    When true, transparent areas of the image are preserved during conversion to GIF format.

    23.0

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